refactor: app metadata (#28113)

* refactor: app metadata

* refactor to per row store

* cleanup

* more test

* review changes

* more refactor

* refactor

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/domain/models/config/system_config.dart

@@ -0,0 +1,18 @@
+import 'package:immich_mobile/domain/models/log.model.dart';
+
+class SystemConfig {
+  final LogLevel logLevel;
+
+  const SystemConfig({this.logLevel = .info});
+
+  SystemConfig copyWith({LogLevel? logLevel}) => SystemConfig(logLevel: logLevel ?? this.logLevel);
+
+  @override
+  bool operator ==(Object other) => identical(this, other) || (other is SystemConfig && other.logLevel == logLevel);
+
+  @override
+  int get hashCode => logLevel.hashCode;
+
+  @override
+  String toString() => 'SystemConfig(logLevel: $logLevel)';
+}